▎ 摘　　要

NOVELTY - A sulfur-doped, graphene-coated nickel-cobalt bimetallic catalyst comprises nickel and cobalt in the form of sulfides, and is wrapped in graphene and loaded on foamed nickel. The catalyst comprises nitrogen fluoride doped nickel-cobalt sulfide (I). USE - Sulfur-doped, graphene-coated nickel-cobalt bimetallic catalyst used for hydrogen evolution (HER) of electrolyzed water. ADVANTAGE - The catalyst improves the conductivity due to the coating of graphene under alkaline conditions, exhibits excellent HER activity, catalytic performance and high stability, and can be prepared by economical and practical method. DETAILED DESCRIPTION - A sulfur-doped, graphene-coated nickel-cobalt bimetallic catalyst comprises nickel and cobalt in the form of sulfides, and is wrapped in graphene and loaded on foamed nickel. The catalyst comprises nitrogen fluoride doped nickel-cobalt sulfide of formula: (NixCoy)Sz:NF (I), where x/y and z are 0-10 (excluding 0). An INDEPENDENT CLAIM is included for preparation of sulfur-doped and graphene-coated nickel-cobalt bimetallic catalyst.